Bump core from b2e7e7a to 1f144e1 (#4425)

Bumps [core](https://github.com/microsoft/typespec) from `b2e7e7a` to
`1f144e1`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/1f144e1a053c710e9ed827b49099ddf8d204e6e9"><code>1f144e1</code></a>
fix(http-client-python): Fix CI (<a
href="https://redirect.github.com/microsoft/typespec/issues/10686">#10686</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/083c943991b180d1962d736c7880f49fb563d94c"><code>083c943</code></a>
feat(http-client-csharp): support dynamic loading of ExternalTypes from
NuGet...</li>
<li><a
href="https://github.com/microsoft/typespec/commit/be01338bf895684482ec5ab2a8eb873cff6cd3db"><code>be01338</code></a>
Add SystemObjectModelProvider for non-generated base type customization
(<a
href="https://redirect.github.com/microsoft/typespec/issues/9862">#9862</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/1e5f02d01d803365ff8e37701b30fe48154cf5dd"><code>1e5f02d</code></a>
Bump C# emitter dependencies to TypeSpec 1.12.0 (<a
href="https://redirect.github.com/microsoft/typespec/issues/10672">#10672</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/4574b5defaab0eb08620bb66e8395d1e5df9594e"><code>4574b5d</code></a>
[http-client-csharp] Filter back-compat-added members against custom
code in ...</li>
<li><a
href="https://github.com/microsoft/typespec/commit/d16ac80bed03f3b133b88e656929e8ec0ff48384"><code>d16ac80</code></a>
[compiler] Resolve members through template parameters. (<a
href="https://redirect.github.com/microsoft/typespec/issues/9868">#9868</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/6f7bc59f85910e34eaf27b325ee6117a50d9574a"><code>6f7bc59</code></a>
fix(openapi3): emit uniqueItems on operation parameter schemas (<a
href="https://redirect.github.com/microsoft/typespec/issues/10656">#10656</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/f96d1295c906ddc7302b0290bcc3449d88bda319"><code>f96d129</code></a>
build(deps): bump astro from 6.1.8 to 6.1.10 (<a
href="https://redirect.github.com/microsoft/typespec/issues/10678">#10678</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/b2e7e7a0b34a95cd419bdef971a3ce3a3fbc3a29...1f144e1a053c710e9ed827b49099ddf8d204e6e9">compare
view</a></li>
</ul>
</details>
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